Possible Boost leak...

[00s4slvr]

So i was looking for a possible boost leak even though my boost i guess is normal and i cam across this which looks like it has to little tears in it.

what is this peice and what does it do?




A Close up of the wire/ Vac hose or whatever this is...



any suggestions???

[00s4slvr]

also does my T-Fitting for the boost gauge look ok... the T fitting i was supplied my awe tuning with was REALLY hard to get the tubing on even when i used wd-40. that was the best i can do before tearing it...

[phantom b6]

I'm pretty sure that's the electrical plug for the n75 .... no air runs through that.

[00s4slvr]

oh well if thats the electricla plug then i couldnt have a boost leak... i guess...

[s42k5b]

Im not sure what that is, it wouldnt cause a boost leak though. I think the N75 is orange, but it is a plug just like that.

[AudiSportB5S4]

I'm pretty sure that's the electrical plug for the n75 .... no air runs through that.

the N75 valve is on the passenger side of the motor right next to the accordion hose



follow all 3 arrows pointing to N75....

I cant see because the picture you provide is so zoomed in but you may be looking at the N249 valve there.

[AudiSportB5S4]

and that's fine for the T fitting ... what kind of boost gauge.. if you are truly worried, which I always like to be sure everything is tight, go to your local autopart store and simply buy a smaller T fitting... any will do the trick, if you want the gauge not to fly around so fast you can get one with a resistor in it, ECS tuning sells them.

what is your boost doing that you asked about a leak?

[00s4slvr]

well i was doing some runs yesterday and the first time i did it i was going 40 and punched it and i have it on the stock setting and the boost went to like 6-7 then up to 8-9 then as it was getting near the redline the boost dropped to 6-7 then after the shift back up to 8-9.

on my second run i punched it going 40 again and it went straight to 8-9 then as it was getting near the redline the boost dropped to 6-7 then after the shift back up to 8-9.

i think i might be worrying to much but does this sound right?

[s42k5b]

Sounds normal to me...I believe boost drops at or near redline. Someone correct me if I'm wrong

[00s4slvr]

i got the awe vent gauge.

[AudiSportB5S4]

Yes it is 100% normal for boost to drop at redline... The reason this happens is because higher up in the RPM range your car is demanding more and more fuel, and to keep a safe A/F ratio the boost drops a bit so the car doesn't run lean..

I made this video well over a year ago when I had a slight boost leak, but do you see how the boost is tapering up top?

http://www.youtube.com/watch?v=dTF8HPXZpLc

that is what I'm talking about, it is not only normal but mandatory! if your boost keeps rising its called boost creep and its not good!

[00s4slvr]

wow yeah i see your gauge is going nuts lol. Anyways what does your Giac X Ecu run at psi wide? Im gettin 14-15 but people say 16-17 which gets me worrying a bit...

[highPSI-S4]

Time to start pressure testing, Giac X spikes @ 18-19psi and tapers down 2 15 by redline.

[AudiSportB5S4]

wow yeah i see your gauge is going nuts lol. Anyways what does your Giac X Ecu run at psi wide? Im gettin 14-15 but people say 16-17 which gets me worrying a bit...

well that video is over a year old, i have a stage 3 now with a VAST tune... But in that video, where I thought I had "bad gas" it was actually my F hose that crapped out on me, and lead to my turbos going byebye.... GIACX should hit around 18-19 just as HighPsi said and taper down 14-15. You may get a slightly lower spike in colder weather as the N75 will adjust since colder air is more dense leading to less boost = same amount of air as high boost in less dense air

[AudiSportB5S4]

Time to start pressure testing, Giac X spikes @ 18-19psi and tapers down 2 15 by redline.

change your dam avatar! you taught me, now go! I want to see that sexy new look you rock lol

[highPSI-S4]

I'm waiting to get some better pics, i don't like the ones i have.

I still get intercooler questions because of that avatar :0)

[sti4now]

my boost has been acting strange lately as well Vacuum at idle is around 18-19psi, but sometimes boost is where it should be 22psi tapers to around 19 at reline, but sometimes it is around 18psi and tapers to 15. K04's APR chip APR fueling. Boost leak maybe? or could it be dirty MAF? Still on stock intercoolers

[AudiSportB5S4]

my boost has been acting strange lately as well Vacuum at idle is around 18-19psi, but sometimes boost is where it should be 22psi tapers to around 19 at reline, but sometimes it is around 18psi and tapers to 15. K04's APR chip APR fueling. Boost leak maybe? or could it be dirty MAF? Still on stock intercoolers

I would look into the boost leak. Pressure test that sucker. No way should you be only holding 15 at redline sometimes stage 3.

[00s4slvr]

well i have no idea how to pressure test and you dont think maybe my N75 is faulty or my diverter valves... Why would my boost be low on pump performance but if i have it on stock mode its compeltely fine?

[00s4slvr]

what about me? on pump performance my boost will be steady 14-15 psi then spike up to 17-18 then taper back down to 14-15.

[00s4slvr]

also i have a tip

[ThirdStrike]

what about me? on pump performance my boost will be steady 14-15 psi then spike up to 17-18 then taper back down to 14-15.

thats not right. your n75 could be failing.
if you have to take it to a shop to get it pressure tested then do so. all a pressure test is is hooking a fitting up to your maf and running air through your system. u will hear a leak.

[00s4slvr]

how hard is it to change the N75?

[00s4slvr]

And why would my boost be normal on stock mode but chipped be messed up?

[ThirdStrike]

jeezus think about the questions you are asking before you post.

look at the location of the n75.. does it look hard to change?? try it then ask.
and uhm if your valve is failing that means it wont be able to hold the higher boost pressures of a aggressive file. stock is whatt 8 psi or something?
since im guessing a MBC would be over your head, buy this;
http://www.ecstuning.com/stage/edpd/...l=&engine=2.7T (ECS - Race N75 Frequency Valve)
its a worth wile upgrade.

[00s4slvr]

well i guess it shouldnt be too hard then since i changed my TBB myself and that came out okay, so im thinking would i be able to do the N75 and Diverter Valves...? Also im low on money and i dont know any shops around here that would pressure test my car... It just doesnt make any sense why my Boost woould be normal on pump but on stock its ok...

[highPSI-S4]

And why would my boost be normal on stock mode but chipped be messed up?

Because the higher the boost the more pressure is bulit up/ Hence the boost reading PSI- Pounds Per Square inch. 8-9 psi might not be enough pressure to cause a leak to become visible or be noticed, the higher PSI levels will cause leaks or tears in hoses to become more noticable. That's why you see the fluctuation. Boost is leaking/escaping out of a hose/or other boost holding related object. There's more to it but i hope you can understand with what i wrote.

Are there local meets,shops in the area? I would get someone to help you pressure test. If you can't understand the logic you shouldn't try to do it yourself and you should do alot more reading on the board as there are alot of helpful threads.

Alsosearch there are countless threads on boost leaks and pressure testing with instructions on how if your up to do it yourself.

[ThirdStrike]

Because the higher the boost the more pressure is bulit up/ Hence the boost reading PSI- Pounds Per Square inch. 8-9 psi might not be enough pressure to cause a leak to become visible or be noticed, the higher PSI levels will cause leaks or tears in hoses to become more noticable

didnt i just say this?

[highPSI-S4]

didnt i just say this?

You did but, i didn't say the same qoute for qoute. I don't think he still would have understood, i tried to break it down a little more. hopefully he'll get it.

[CONTROL ONE]

Would it be worthwhile to replace the N75 valve on a car that isn't necessarily acting strange but more of a precaution?

Same thing I guess as the DV's and TBB. Most ppl don't wait until they fail, they replace them before that happens - is it the same with the N75 valve?

[ThirdStrike]

Would it be worthwhile to replace the N75 valve on a car that isn't necessarily acting strange but more of a precaution?

the ecs "race" valve seemed like a better solution to me. id say get it.

You did but, i didn't say the same qoute for qoute. I don't think he still would have understood, i tried to break it down a little more. hopefully he'll get it.

he needs to read and stop asking redundant questions jeez

[00s4slvr]

ok so i ordered the N75 Race valve and the Bosch 710n's. My questions is, is there a write up to install the Dv's? How hard is it to install those? I have been getting mixed reviews, some people saying there a PITA and some saying there easy like cake...

Are they hard to install?

[AudiSportB5S4]

ok so i ordered the N75 Race valve and the Bosch 710n's. My questions is, is there a write up to install the Dv's? How hard is it to install those? I have been getting mixed reviews, some people saying there a PITA and some saying there easy like cake...

Are they hard to install?

how long does it take you to get to westchester area in new york? if you want I will install them for you, no cost just to help. if you want.

[ThirdStrike]

how long does it take you to get to westchester area in new york? if you want I will install them for you, no cost just to help. if you want.

man dont pick up a wrench for this guy/kid. instruct him. he wants someone to do the work for him

[00s4slvr]

Hey thirdstrike what the hell is your problem im sorry im still learnin...

And audisportb5s4 im gonna be picking up a borla exhaust that i just bought from a guy on the forums (borla!!!) and he lives in westchester so i will be there this weekend, but the parts wont be here for probably a week... there coming from ecs tuning.

[00s4slvr]

i dont want anyone to do the work for me i want someone to teach me/ guide me how... i dont see whats wrong with that...

[00s4slvr]

yeah if you wanna help that would be great and i am gonna have to pay you something because i cant just let people help me for free thats just rude.

[ThirdStrike]

all im sayin is try doing it yourself. its really not that hard.

[00s4slvr]

i am going to... its just nice that he offered to help me...

[00s4slvr]

i am going to i just asked if anyone knew if there was a write up for the Dvs or N75?